Stockbroker is a professional who has the authority to buy and sell stocks derivatives, bonds, currency trades and securities on the behalf of the investor in a stock exchange. A stockbroker is someone who is involved in the trading profession. A stockbroker job role is also known as an investment advisor or registered representative. Individuals who opt for a career as a stockbroker are employed by brokerage firms to manage transactions for individual and institutional clients. A stockbroker’s earnings are dependent on the commission.